TODAY JUL20
TEMPERATURE70
HUMIDITY81
PRESSURE29.94
WIND COND.
  • 9067Fri
  • 9068Sat
  • 9369Sun
  • 9972Mon
  • 10173Tue
daynightWeather update from Los Angeles / USC Campus Downtown at

South Arroyo Average Weather

In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
MonthTemp. (min)Temp. (max)Temp. (avg)Precipitation
January16°F73°F43°Fn/a
February19°F72°F44°Fn/a
March19°F81°F45°Fn/a
April23°F84°F50°Fn/a
May32°F86°F60°F0.4"
June36°F91°F67°Fn/a
July57°F99°F76°F0.0"
August48°F97°F73°Fn/a
September36°F95°F68°Fn/a
October27°F86°F57°Fn/a
November28°F82°F54°Fn/a
December19°F73°F44°Fn/a

Did you know?

  • The highest monthly average temperature in South Arroyo for July is 76 degrees.
  • The lowest monthly average temperature in South Arroyo for January is 43 degrees.
  • The most monthly precipitation in South Arroyo occurs in May with 0.4 inches.
  • The air quality index in South Arroyo is 48% worse than the national average.
  • The pollution index in South Arroyo is 2652% worse than the national average.

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Compare Pasadena, CA Weather To Other Cities

South Arroyo air quality index & pollution index

In the event that the air quality/pollution data was unavailable for this city, estimates based upon nearby cities were used.
IndexSouth ArroyoPasadenaCalifornia
Air quality index747455
Pollution index139,490,000139,490,00018,106,726

South Arroyo air quality information

MeasurementTotal
Days measured365
Days with good air quality25
Days with moderate air quality260
Days w/ poor A.Q. for sensitive groups76
Days with unhealthy air quality4

South Arroyo air quality information

PollutantTotal
Arsenic0.200%
Benzene0.950%
Carbon Tetrachloride0.080%
Lead1.320%
Mercury0.440%

Average monthly South Arroyo temperature with heat index

South Arroyo monthly precipitation with daily maximum

South Arroyo monthly snow depth with daily maximum

South Arroyo monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Ladera Heights, CA7,1957448%
Lennox, CA21,9637448%
Maywood, CA27,6727448%
North El Monte, CA4,0587448%
San Gabriel, CA40,2007448%
Pasadena, CA140,2687448%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Orange, CA139,9198570%
Fullerton, CA139,4917448%
Dayton, OH141,143484%
Killeen, TX138,7453628%
McAllen, TX138,4753628%
Pasadena, CA140,2687448%
Source: The South Arroyo, Pasadena, CA weather data displayed above is derived from the NOAA (National Oceanic and Atmospheric). Air quality and pollution data is derived from the EPA (United States Environmental Protection Agency). Air quality and pollution levels measured in a particular area may not be representative of the entire county.